const state = {
	visitedViews: [],
	cachedViews: [],
}

const mutations = {
	ADD_VISITED_VIEW: (state, view) => {
		if (state.visitedViews.some(v => v.path === view.path)) return
		state.visitedViews.push(
			Object.assign({}, view, {
				title: view.meta.title || 'no-name',
			}),
		)
	},
	ADD_CACHED_VIEW: (state, view) => {
		if (state.cachedViews.includes(view.name)) return
		if (!view.meta.noCache) {
			state.cachedViews.push(view.name)
		}
	},

	DEL_VISITED_VIEW: (state, view) => {
		for (const [i, v] of state.visitedViews.entries()) {
			if (v.path === view.path) {
				state.visitedViews.splice(i, 1)
				break
			}
		}
	},
	DEL_CACHED_VIEW: (state, view) => {
		for (const i of state.cachedViews) {
			if (i === view.name) {
				const index = state.cachedViews.indexOf(i)
				state.cachedViews.splice(index, 1)
				break
			}
		}
	},

	DEL_OTHERS_VISITED_VIEWS: (state, view) => {
		state.visitedViews = state.visitedViews.filter(v => {
			return v.meta.affix || v.path === view.path
		})
	},
	DEL_OTHERS_CACHED_VIEWS: (state, view) => {
		for (const i of state.cachedViews) {
			if (i === view.name) {
				const index = state.cachedViews.indexOf(i)
				state.cachedViews = state.cachedViews.slice(index, index + 1)
				break
			}
		}
	},

	DEL_ALL_VISITED_VIEWS: state => {
		// keep affix tags
		const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
		state.visitedViews = affixTags
	},
	DEL_ALL_CACHED_VIEWS: state => {
		state.cachedViews = []
	},

	UPDATE_VISITED_VIEW: (state, view) => {
		for (let v of state.visitedViews) {
			if (v.path === view.path) {
				v = Object.assign(v, view)
				break
			}
		}
	},
}

const actions = {
	addView ({dispatch}, view) {
		dispatch('addVisitedView', view)
		dispatch('addCachedView', view)
	},
	addVisitedView ({commit}, view) {
		commit('ADD_VISITED_VIEW', view)
	},
	addCachedView ({commit}, view) {
		commit('ADD_CACHED_VIEW', view)
	},

	delView ({dispatch, state}, view) {
		return new Promise(resolve => {
			dispatch('delVisitedView', view)
			dispatch('delCachedView', view)
			resolve({
				visitedViews: [...state.visitedViews],
				cachedViews: [...state.cachedViews],
			})
		})
	},
	delVisitedView ({commit, state}, view) {
		return new Promise(resolve => {
			commit('DEL_VISITED_VIEW', view)
			resolve([...state.visitedViews])
		})
	},
	delCachedView ({commit, state}, view) {
		return new Promise(resolve => {
			commit('DEL_CACHED_VIEW', view)
			resolve([...state.cachedViews])
		})
	},

	delOthersViews ({dispatch, state}, view) {
		return new Promise(resolve => {
			dispatch('delOthersVisitedViews', view)
			dispatch('delOthersCachedViews', view)
			resolve({
				visitedViews: [...state.visitedViews],
				cachedViews: [...state.cachedViews],
			})
		})
	},
	delOthersVisitedViews ({commit, state}, view) {
		return new Promise(resolve => {
			commit('DEL_OTHERS_VISITED_VIEWS', view)
			resolve([...state.visitedViews])
		})
	},
	delOthersCachedViews ({commit, state}, view) {
		return new Promise(resolve => {
			commit('DEL_OTHERS_CACHED_VIEWS', view)
			resolve([...state.cachedViews])
		})
	},

	delAllViews ({dispatch, state}, view) {
		return new Promise(resolve => {
			dispatch('delAllVisitedViews', view)
			dispatch('delAllCachedViews', view)
			resolve({
				visitedViews: [...state.visitedViews],
				cachedViews: [...state.cachedViews],
			})
		})
	},
	delAllVisitedViews ({commit, state}) {
		return new Promise(resolve => {
			commit('DEL_ALL_VISITED_VIEWS')
			resolve([...state.visitedViews])
		})
	},
	delAllCachedViews ({commit, state}) {
		return new Promise(resolve => {
			commit('DEL_ALL_CACHED_VIEWS')
			resolve([...state.cachedViews])
		})
	},

	updateVisitedView ({commit}, view) {
		commit('UPDATE_VISITED_VIEW', view)
	},
}

export default {
	namespaced: true,
	state,
	mutations,
	actions,
}
